I don't agree with BT that running cables 'neatly' around skirtings and door frames is an acceptable installation but my PC is upstairs so I'll be running my own prior to the visit.
My questions are -
What cable and plugs will be needed?
Does it matter where the home hub goes? Next to PC upstairs or Down with the Modem?
My wife has a Wireless g card in her laptop. I have Wireless n on my PC as an option. If we both connect wirelessly, is it true that the speed will default to the slower g speed?
Could I just get the engineer run the cable but not fix it so that I can install a cable at a later date? I'm thinking just in case I find that the wireless side of things is actually OK and there is no need to run a cable.
I think that's it.

Thanks